thermostat question

thermostat question

This is a discussion on thermostat question within the RAM 1500 Diesel Maintenance forums, part of the RAM 1500 Diesel Garage - RAM 1500 Diesel Mechanics Corner category; what are the symptoms of a 3 way coolant valve that is going bad? are they the same as a thermostat going bad? my oil ...

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  1. #1
    RAM Rookie minis2003's Avatar
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    thermostat question

    what are the symptoms of a 3 way coolant valve that is going bad? are they the same as a thermostat going bad?
    my oil temps where at 225F in stop in go traffic not towing anything and outside temp was 83F
    once turning on ac temp dropped to 208F what is normal for me when driving
    I know the temp is not high just higher than normal I was thinking about change the 3 way coolant valve and coolant flush
    miles on the eco diesel is 45K with a GDE tune since 15K

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    RAM Diamond Member Captainmal's Avatar
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    I played that game with that three-way valve. Darn thing is expensive as it has electronics in it.

    It does regulate coolant to heater, air conditioner, transmission etc. Obviously it worked as the temperature dropped when the sir conditioner turned on. Guessing it's is operating. Guessing there may have been a fan issue that may not have turned on quickly enough while stopped. Guessing your transmission was normally cool and that valve got it fluid. Guessing, guessing, guessing there really was no problem. Darn things run hot when it's hot and sometimes even when it's cold.
    If you wrestle with a pig you'll both get dirty and the pig loves it. .

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    RAM Ninja Kazimodo's Avatar
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    Quote Originally Posted by minis2003 View Post
    ..what are the symptoms of a 3 way coolant valve that is going bad? are they the same as a thermostat going bad?
    ..
    your symptoms are different , but in this thread you will see one possible way the unit can fail ,

    https://www.ram1500diesel.com/forum/r...tml#post836570

    post # 51 by Ben28881 : with 2 pictures , ==> truck warming up , no cell ,
    then when warm , 3 way valve sending too much coolant to the transmission , and temperature is not coming
    up as it should , so computer throws a cell ,
    ===> check engine light is ON ==> code P26AB

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    RAM Ninja shaggn85's Avatar
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    Quote Originally Posted by minis2003 View Post
    what are the symptoms of a 3 way coolant valve that is going bad? are they the same as a thermostat going bad?
    my oil temps where at 225F in stop in go traffic not towing anything and outside temp was 83F
    once turning on ac temp dropped to 208F what is normal for me when driving
    I know the temp is not high just higher than normal I was thinking about change the 3 way coolant valve and coolant flush
    miles on the eco diesel is 45K with a GDE tune since 15K
    The three way valve doesn't affect your engine oil cooler. It sends heat to the heater coil and the trans warmer.

    The reason your temp dropped was the cooling fan kicked on and pulled some heat from your coolant.

    Check your coolant level. It has to stay above the seam in the recovery tank..
    howie12 likes this.

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    RAM Rookie minis2003's Avatar
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    trans temp was good and the coolant level is good has not moved just wondering what could have causes a little higher then normal oil temp
    on a cool day not towing anything in stop in go traffic
    oh well I will just keep an eye open

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    Super Moderator Crash68's Avatar
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    Quote Originally Posted by minis2003 View Post
    my oil temps where at 225F in stop in go traffic not towing anything and outside temp was 83F
    once turning on ac temp dropped to 208F what is normal for me when driving
    You answered your question here. When you turned the AC on, the cooling fan turns on at a low speed regardless of engine temp, also the AGS is forced open. There is an oil cooler on these engines, it's part of the filter assembly.
    I've seen the engine coolant and oil temps run warmer than normal till I turned the AC or defroster on several times. I've even tested the theory by turning the AC/defrost back off and watch the temps creep back up.

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    RAM Veteran Bgbdwlf2500's Avatar
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    Quote Originally Posted by minis2003 View Post
    trans temp was good and the coolant level is good has not moved just wondering what could have causes a little higher then normal oil temp
    on a cool day not towing anything in stop in go traffic
    oh well I will just keep an eye open
    Stop and go will do that. I keep my display on the temps all the time so I've seen all temps fluctuate in many scenarios

    Sent from my SM-N950U using Tapatalk

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    RAM Rookie minis2003's Avatar
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    opened up my grill by cutting some of the the material out on Friday and Saturday drove again in the same conditions but this time the temp only got to 215F (OIL)
    I guess the stock grill is more restrictive then I thought. maybe I will replace it with another one when I have some free time
    highway speeds 80mph temp never went above 213F(OIL).
    did not touch the AGS

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    RAM Bronze Member Bounty Hunter's Avatar
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    Which model Ram do you have? Several models have better flowing grilles than others.

    I swapped my restrictive Laramie grille inserts for Laramie Longhorn inserts.
    navyr113 likes this.
    2016 Laramie CC 6'4", Delmonico Red, GDE Hot tune and Trans tune, External oil cooler, PPE Trans pan

  11. #10
    RAM Rookie minis2003's Avatar
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    lonestart model
    looking at replacing the inserts with these
    https://moparonlineparts.com/1500-grille-p-4231.html
    Kazimodo likes this.

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